Vinyl chloride resin composition

Abstract

The present invention provides a vinyl chloride resin composition having an improved resistance to warm-water bleaching. The vinyl chloride resin composition according to the present invention is characterized by comprising, with respect to 100 parts by mass of a vinyl chloride-based resin, 0.01 to 10 parts by mass of (a) a zinc-modified hydrotalcite and 0.01 to 10 parts by mass of (b) an acrylic processing aid having a weight-average molecular weight of 200,000 to 7,000,000. The above-described (a) zinc-modified hydrotalcite is preferably a compound represented by the following Formula (I): Mg x1 Zn x2 Al 2 (OH) 2(x1+x2)+4 .CO 3 .m H 2 O  (I) (wherein, x1 and x2 each represent a number satisfying the conditions of the following equations; and m represents a real number: 0.1≦x2/x1<10, 2≦x1+x2<20).

The invention claimed is: 
     
       1. A vinyl chloride resin composition, comprising, with respect to 100 parts by mass of a vinyl chloride-based resin,
 0.05 to 3 parts by mass of (a) a zinc-modified hydrotalcite and 
 0.01 to 10 parts by mass of (b) an acrylic processing aid having a weight-average molecular weight of 200,000 to 2,000,000; 
 wherein said (a) zinc-modified hydrotalcite is a compound represented by the following Formula:
   Mg 3.5 Zn 1 Al 2 (OH) 12 .CO 3 .3H 2 O. 
 
 
     
     
       2. The vinyl chloride resin composition according to  claim 1 , wherein said (a) zinc-modified hydrotalcite has a refractive index of 1.52 to 1.56. 
     
     
       3. The vinyl chloride resin composition according to  claim 1 , which comprises a plasticizer component in an amount of 0 to 10 parts by mass with respect to 100 parts by mass of said vinyl chloride-based resin.